HGH 191AA (Somatropin) is recombinant human growth hormone composed of the native 191–amino-acid sequence. In research settings it is used to study growth hormone (GH) physiology, downstream insulin-like growth factor-1 (IGF-1) signaling, body-composition proxies, and recovery-adjacent biomarkers in controlled models.
Somatropin binds the growth hormone receptor, activating JAK2/STAT pathways and stimulating hepatic and peripheral IGF-1 production. Research explores effects on protein synthesis, lipolysis, fluid balance, glucose handling, sleep architecture, and tissue remodeling signals.
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